Podcast
Questions and Answers
What is a primary objective of protected cultivation?
What is a primary objective of protected cultivation?
- Minimize pest control efforts
- Reduce the need for water
- Obtain high value products (correct)
- Increase labor costs
Which of the following is NOT an example of a method used for crop protection in greenhouses?
Which of the following is NOT an example of a method used for crop protection in greenhouses?
- Pesticide spraying (correct)
- Floating covers
- Irrigation
- Windbreaks
Which greenhouse orientation is recommended for maximizing sunlight exposure?
Which greenhouse orientation is recommended for maximizing sunlight exposure?
- North-South (correct)
- East-West
- South
- North
Which of the following is a disadvantage associated with greenhouses?
Which of the following is a disadvantage associated with greenhouses?
Which material can be used to create windbreaks around a greenhouse?
Which material can be used to create windbreaks around a greenhouse?
What type of greenhouse is most appropriate for maximum radiation energy absorption in cloudy areas?
What type of greenhouse is most appropriate for maximum radiation energy absorption in cloudy areas?
Which type of greenhouse is primarily used in cold areas?
Which type of greenhouse is primarily used in cold areas?
What is the typical slope angle range for the walls of a mansard roof greenhouse?
What is the typical slope angle range for the walls of a mansard roof greenhouse?
Which type of greenhouse is best suited for uneven terrain?
Which type of greenhouse is best suited for uneven terrain?
What structural form characterizes a greenhouse with a roof steeper than the upper roof?
What structural form characterizes a greenhouse with a roof steeper than the upper roof?
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Study Notes
Protected Cultivation
- Aims to produce high-value products.
- Involves growing crops in controlled environments, like greenhouses.
- Addresses unfavorable conditions such as low solar radiation, water/nutrient levels, and weeds.
Greenhouse Design
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Orientation:
- North-South recommended for optimal sunlight.
- East-West orientation is suitable for locations above 30º North or South latitude.
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Greenhouse Structures:
- Gothic Arch: Semi-circular shape.
- Quonset: Curved structure.
- Mansard Roof: Walls slope at 60-70° angles.
- Lean-to: Cost-effective, built adjacent to a building.
- Gable Even Span: Most common, suitable for all crops.
- Uneven Span: One side of the roof is longer than the other.
- Ridge and Furrow: Prone to wind and snow issues.
- Paraboloid Hyperbolic: Suitable for cold areas.
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Location Factors:
- Proximity to markets, roads, and water sources.
- Windbreaks are essential, preferably located on the north and west sides.
- Distance from buildings: Windbreaks should be 100-200 feet away from structures.
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Foundation Considerations:
- Built on a concrete slab, using materials like cement and wood.
- Porous concrete in flooring allows water drainage.
- Wood requires treatment to prevent corrosion.
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Types of Soilless Growing Systems:
- Hydroponics: Growing plants without soil, known for higher productivity and reduced water usage.
- Sand Culture: Similar to hydroponics, but uses sand as a medium.
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Greenhouse Cover Materials:
- Glass: Offers high light transmittance and durability.
- Fiberglass: Affordable and durable, often chosen for greenhouse covers.
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Greenhouse Layout:
- Connected Greenhouses: Require more heat than separate greenhouses.
- Separate Greenhouses: Easier to expand or contract production.
- Oval Layout: Reduces dimensional issues compared to rectangular layouts.
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